This article describes the Carta Marina by Olaus Magnus are for sailors, which happens to also include profoundly bizarre and ferocious sea monsters. Some are big enough to be mistaken for islands, others have blades on their backs for slicing open ships, and almost all have a taste for human meat.

You’re no longer lost, but unfortunately for you, you’ve gone catatonic with fear, because you’re holding what is perhaps history’s premier document of sea monster lore. And you’re on the sea.